I hear what you are saying and will only offer my findings about Bills ability to survive. When I entered the military Survival school I was in the best shape of my life. I had the skills to survive in that I knew how to survive until I realized I was lacking in the preparation of the mind. I found myself looking into the darkest deepest part of my character and soul and it took every ounce of strength I had to overcome frustration fear and mental softness.
Today I find that if I prepare my mind the rest falls in place, if I let my mind become weak I am in trouble. Remember this is just one person me and what I found when put in a situation that required I survive.